Re: [dpdk-dev] Build failures in 21.11-rc2

Hi all,

It looks like the problem caused by the lack of _mm512_set1_epi8() 
implementation inside the gcc8, however _mm512_set1_epi[16,32,64] has 
been implemented.
I replaced it with _mm512_set1_epi32 and on gcc8 it builds fine. I'll 
send a fix soon.

On 09/11/2021 17:22, Lance Richardson wrote:

Based on the CI build logs, the target architecture was Skylake, which
supports AVX512 but doesn't support GFNI.

On Tue, Nov 9, 2021 at 11:15 AM Thomas Monjalon [off-list ref] wrote:

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09/11/2021 17:12, Lance Richardson:

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Do the machines used for the CentOS 8 CI builds support AVX512?

Probably not. OK thank you.

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The failing build is on an Ice Lake server with:
      meson -Dmachine=native build
      ninja -C build

On Tue, Nov 9, 2021 at 11:08 AM Thomas Monjalon [off-list ref] wrote:

quoted

09/11/2021 16:57, David Marchand:

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On Tue, Nov 9, 2021 at 4:53 PM Lance Richardson
[off-list ref] wrote:

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21.11-rc2 builds are failing on CentOS 8.4, apparently because
the intrinsic _mm512_set_epi8() is not defined in the GCC
headers (see example below).

Thanks for reporting Lance.
It rings a bell, think it was mentionned in the past.

CI compilation was passing:
http://mails.dpdk.org/archives/test-report/2021-November/238534.html
I would like to better understand.

[...]

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Here is a GCC patch to add this intrinsic:
https://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg188664.html

BTW, GCC 10.2.1 (via "scl enable gcc-toolset-10") is able to build
21.11-rc2 successfully on CentOS 8.4.

     Lance

# gcc --version
gcc (GCC) 8.4.1 20200928 (Red Hat 8.4.1-1)

[...]

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../lib/hash/rte_thash_x86_gfni.h:59:24: error: implicit declaration of
function ‘_mm512_set_epi8’; did you mean ‘_mm512_set1_epi8’?

What is different in your setup compared to the CI?

-- 
Regards,
Vladimir